NSP Home Blogs

How Much Does It Cost to Build a Luxury Duplex in Sydney’s Inner West? If you’re considering building a duplex in Sydney’s Inner West, the first question is always: how much will it actually cost? As boutique builders specialising in luxury dual-occupancy homes, NSP Home has guided dozens of families through this exact decision. This guide breaks down the real numbers—backed by Rawlinsons Australian Construction Handbook 2026 data and our own project experience—so you can bud